Instead of adding to Jerry's Mod thread I figured to just kick in a new one that can be one and done.
I finally got my 'rountoit' on this mod. A while back I bought a 2 gal expansion tank off Amazon to install into the fresh water system after the pump. I chose to go bigger than the 2L variety for more storage. That tank came in with the bladder set at 35 psi, then I upped it to 45 because I was thinking the wrong way.
Today I checked the output pressure at the pump to aid in setting the bladder pressure. Static pressure = 38 - 40 psi, Cold water running full in shower = 35-37, Cold/Hot running full in shower = 30-32 psi. I set the bladder @ 15-17 psi, then plumbed into pump output line off the branch of a tee between pump and house line. Lo and Behold, it worked!!! It's amazing how physics works when you apply it correctly!! Now it is about 20 seconds of full flow from a faucet before the pump kicks on, so when sharing the RV with someone, the pump doesn't announce the use of the potty in the middle of the night.
This install was basically proof of concept, so now I need to pretty up the installation, strap in the tank and make it travel worthy and ship shape. Pictures to come after that.